Il8 TOWERS AND TANKS FOR WATER- WORKS. 



When the tank bottom is conical (Fig. 24) the load T on the 

 joint is applied along the elements of the cone. To provide for 

 its resistance it must be resolved into its horizontal and vertical 

 components H and V. 



W sec 6 W tan 



H=Tsmd = - -Xsin0 = - 



Wsecd W 



V=Tcosd = 



27ZT 2T.T 



The horizontal component is a uniform radial force amount- 



WtSind 

 ing to pounds per lineal inch of perimeter pulling toward 



the axis of the cylinder. This produces compression in the 

 ring of material constituting the joint. Using this normal pres- 

 sure and considering the ring cut by a vertical plane, it will be 

 seen that the total compression on a section of the ring is 



WtznO Wi&n g. 



2-r 



The vertical component V is resisted by the circular girder. 

 Its analysis will be considered hereinafter. 



Considering the segmental bottom (Fig. 24) in a similar manner, 



W esc co _W cot a) 



2~r CC 2nr ' 



TFcsc 



C =0.159 PT cot a) - 

 When ^ = 90 the bottom is a hemisphere and H and C become o. 



